Square miles to hectares conversion factor is 258.998811. To find out how many hectares in square miles, multiply the square mile value by 258.998811.
1 Square Mile = 258.998811 Hectares
There are about 259 hectares in a square mile, because a hectare is a square with all sides are 100 meters in length and equals to 100 * 100 = 10 000 square meters and one mile is 1609.34 meters and equals to 1609.34 * 1609.34 = 2589975.2 square meters, that makes 2589975.2 / 10 000 = about 259 hectares in a square mile.
For example, to find out how many hectares there are in a square mile and a half, as a formula to convert from sq. miles to hectares, multiply the sq. mile value by 259, that makes 1.5 mi2 * 259 = 388.5 hectares in 1.5 sq. miles.
Square mile is an imperial and US Customary area unit. 1 Square mile is equal to 259 hectares, 640 acres or 2.59 square kilometers. The abbreviation is "mi^{2}".
Hectare is a metric system area unit. 1 Hectare is equal to 10 000 sq. meters or 2.47 acres. The abbreviation is "ha".